verticalAlign: String

This property lets you align the Legend Position vertically.

• By combining this with horizontalAlign, Legend can be aligned in nine positions on the chart.

Options	horizontalAlign	verticalAlign
1	“left”	“top”
2	“left”	“center”
3	“left”	“bottom”
4	“center”	“top”
5	“center”	“center”
6	“center”	“bottom”
7	“right”	“top”
8	“right”	“center”
9	“right”	“bottom”

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 legend :{
  verticalAlign: "center",
 },
 .
 .
});
chart.render();